Apparatus for electrically operating and controlling planing-machines and the like reciprocating tools.



A. P. WO0D. APPARATUS FOR ELECTRICALLY OPERATING AND CONTROLLING PLANING MACHINES AND THE LIKE RECIPROCATING TOOLS.

APPLICATION FILED AUG- 19. 1912.

Patented July 20, 1915.

2 SHEET Sr-SHEET Iva/Q2707: A7- url? Wood I &@/ %/m wa x gzg Raf; alJ-m A. P. W000. APPARATUS FOR ELECTRICALLY OPERATING AND CONTROLLlNG PLANING MACHINES AND THE LIKE RECIPROCATING TOOLS.

APPLICATION FILED AUG- 19, 1912. 1,147,666,

2 SHEETSSHEET 2.

Patented July 20, 1915.

To all whom it may concern UNITED. STATES PATENT OFFICE.

' humus, rnmsnn'ron woon, or HALE, ENGLAND.

AIEIE'ARAT'US F03 ELECTRICALLY OPERATING AND CONTROLLING PLANTING-MACHINES AND THE LIKE REGIPROCATIN'G TOOLS.

Specification of Letters Patent.

Patented July 20, 1915 Application filed August 19, 1912. Serial No. 715,874.

Be it known that I, ARTHUR PEMBnR'roN 'WooD, a subject of theKing of Great Britair], and residing in Hale, in the county of Chester, England, have invented certain new and useful Improvements in Apparatus for Electrically Operating and Controlling Planing-Machines and the like Reciprocating Tools, of which the following is a specification. I

This invention relates to apparatus for electrically operating and controlling planing machines and the like reciprocating tools, and has reference more particularly to that type of planing machine or reciprocating tool in which there are two feed-screws, or two sets of feed-screws or the like traversing devices; which may alternatively be used respectively for making the working, that is to say, the cutting stroke, or for traversing the tool acrossthe work at the end of each cut, the arrangement being such that when the one device is used to make the working stroke'the other is used to give the necessary traverse. In such machines, as at present constructed, and when electrically operated, the electro-motor is so geared to the machine that it' is adapted to operate either one or other of the feed-screws, the

remaining feed screw being operated by theusual mechanical tappet motion; or in some cases two motors may be fitted, one to each feed-screw, in which case the feed-screw used for traversing is disconnected from its motor and is operated by the usual mechanical tappet motion.

According to the present invention a reversing motor is fitted to each feed-screw or set of feed-screws, and the electrical arrangement is such that when the one motor is used to make the working stroke, the

other motor is not disconnected from its feed-screw but is connected to a switch or switches operated by tappet gear actuated by the reciprocating part, or by a part connected therewith, so that at the end of each stroke, a voltage is applied to it for a sufiiciently long period to' impart to it the necessary small angular movement to efiect the desired traverse or feed.

The invention is illustrated in the accompanying drawings which show, by way of example my invention applied to a horizontal and vertical planer, and in which Figure 1 is a, side view of the tool and motors; Fig. 2 a corresponding end elevat on; and Fig. 3 a diagram of the connections and the switch gear.

In the type of planer selected for illustratlon, the work tobe planed is stationary, and there are two sets of feed-screws, one set of two screws ct, a, to give the tool holder B a horizontal movement, and one screw c'to glve it a vertical movement. I connect, preferably directly, a reversing electro-motor to each of the'feed-sc'rews or set of feed-screws, and, 1n the latter case, mechanically gear the several feed-screws of a set together so as to insure synchronous movement. The motor A 1s connected to the two screws'a, 0), say by means of the pairs of. bevel wheels a, connecting the motor spindle to a tz ansverse shaft, and pairs of bevel wheels a connecting this shaft to the respective screws 0;. The motor C is connected to the screw 0 by the spur gearing c The drawing shows a convenient mode of arranging the motors, but the positions of the motors and mode of connecting them to the planer will depend upon the type of tool. The arrangement of the screws, slides S, tool carrier B, and main frame D are of the usual construction and need not be further described.

The switch gear and apparatus by which a motor is connected to the supply mains when employed to reciprocate the tool will be termed the working motor operating gear, and the switch gear and'apparatus by which a motor is connected to the supply mains when employed to traverse a tool by 3 be employed, but preferably that illustrated in Fig. 3. The twomotors are connected to a change-over switch which when in one position connects the motor A. to the work ing motor operating gear and connects the motor C to the traversing motor operating gear, and which when in the other position reverses these connections.

Referring now to Fig. 3, which is a dia' gram or the general arran ement of the switches and connect1ons,-

is the motor 1m geared to the screws a, a, which it will be assumed are being used for giving a reciprocating motion to the tool carrier B. C is the motor geared to the screw which under these circumstances w1ll be used for feedlng the tool across the 'work for'successive cuts.

As and Cs are, respectively, the shunt wind- .connectthe armature of A to the mains F and the armature of C to the mains G, or,

alternatively, the armature of A to the mains G' and the armature of C to the mains F.

Under the conditions assumed, the blades 6 and c of the switch E connect the armature of the motor A to the mains F, and the blades e and e of this switch connect the armature of the motor C to the mains Gr. If the switch E be moved to the left the armature of the motor A will be connected by the bladesIe and e to the mains G and the armature of the motor C will be connected by the blades 6' and e to the mains F. The mains Glare connected to a generator such as H having a constantly driven armature, and the switch T (which is adapted to be closed by the tappet gear 25 t as shown in Fig. 1) may be employed to momentarily excite the shunt field of the said generator which then generates current and actuates the motor C, the degree of actuation being controlled by the regulation of a shunt resistance such as K. I prefer, however, to fit a device the function of which is to regulate and definitely determine the anular movement to be imparted to the motor I have shown such a device diagrammatically in Fig. 3.

Referring again to Fig. 3, the mains G are energized by the feed generator H designed to give a comparatively low voltage, and the armature of which may be mechanically coupled to the main generator, or to the motor driving thelatter; the armature of H therefore runs continuously while the machine is in operation. He is the field winding of the feed generator H. The field winding H8 is connected through a reversing switch J, shunt regulator K and contacts m of'the rotary switch M to the supply mains P. The mains G are adapted to be connected together through a brake resistance S when the contacts a, n, of the rotary switch N are connected together. The function of the resistance S when connected across the mains G is to form a circuit in which the kinetic energy stored up in the armatures of the working motor and the generator H, after the field of the latter has been deenergiz'ed, is used up as heat generated by the current in this circuit. The rotary switches M, N and a disk 0 are connected together by the one shaft, which shaft is adapted to be driven at a suitable speed by any suitable form of friction drive,

say by means of a friction clutch driven against a stop m", and a toothed disk m located between m and m and driven by a chain m" from the wheel 71, on the shaft 71. connected to the armature of H by gear h The disk 0 is provided with a notch o and the trip coil 0 is provided with a detent plunger 0 the arrangement being such that the plunger 0 normally engages in the notch and holds the rotary switches M and N stationary in the position shown in the drawings; the portion m of the switch M and the portion a of the swtich N are of conducting material, so that in. the stationary position the contacts m, m, are disconnected, while the contacts 12., n, are connected. The switch T is adapted, when closed, to connect the trip coil 0 across the suppl mains P. The switch T is momentaril clbsed when the pawl t (see Fig. 1)- carried by the bar 25 is moved from left to right by any suitable and adjustable tappet motion on the reciprocating parts. The switch T is pro:

vided with a spring t which normally holds the switch open.

It will be seen that if, just rior to a cutting stroke, the switch T is c osed, the trip coil 0 is momentarily energized, and the plunger detent o is raised clear of the notch, whereupon the frictional drive will cause the rotation of the .rotary switchesM and N. The first effect will be to open the circuit of the brake coil S; next, to energize the shunt winding 8 of the feed generator H, whereupon the motor C will begin to rotate, since the constantly running armature of H will now generate. screw to which it is attached will continue moving until the switches M and N have made one complete rotation, and return to the position shown in the drawin when the shunt coil H8 is disconnected gom the mains and the brake resistance S connected across the armature of the feed generator H and motor C, thus bringing the latter instantly to rest. The rotary switches will be maintained in this position by theplun r detent 0 engaging in the notch 0 e amount of movement im arted to the motor 0 while the rotary switc es make one turn, may be regulated by regulating the strength of the current in the field wmding he by means of the regulator K.

It is necessary to be able to rotate the screw which is giving the :Eeedand of The motor C and the feed course the motor operating it-in either direction; this is accomplished in the arrangement illustrated by means of the reversing switch J which reverses the field of the generator, and of course causes the motor coupled to it to reverse its direction of rotation. The switch J is operated by hand by the attendant as required. It will be seen that while the motor A is operated so as to cause the reciprocation of the tool, the motor 0 is operated so as to 've the tool the desired feed at the end 0 each stroke. Should it be desired to use the planer so as to reciprocate the tool vertically and to feed the cut horizontally, it is only necessary to throw over the switch E so that the blades e and 6 now connect the motor A to the across the mains P;

mains G and the blades 6 and 6 connect the motor C to the mains F.

. vThe mains F are connected to the armature of a generatorQ driven by a motor 9 g is the motor field winding connecte Q is'the generator to be connected by the two way reversing switch R directly across the mains P (when the switch R is in the position shown in full lines) so that the current flows from one of the mains P to the other through contact 7, blade 1' contact r, conductor 1-, field winding Q conductor 1, contact 1", blade 1'' and contact 1- When the switch R is moved to the position shown in dotted lines the field winding Q} is connected across the mains P in series with the resistance Q in which case the current flows in the opposite direction, viz :-through 1' 1' conductor 1*, resistance Q field winding Q conductor 1-, blade 1- and contact 1' Thus when the switch It is moved from one positionto the other the direction of" the current in the mains F is reversed and its magnitude altered. The switch R is operated by a tappet lever W and rod 10 and the tappet lever is field winding adapted actuated by the reciprocating part of the tool by a tappet 'w' on the rod w connected to said rec1procating part.

The reversing switch forms no part of the present invention.

The arrangement is very compact,and ob- R is known and viates the use of the cumbersome gearing which is necessary when one motor has to be employed alternatively to drive the horizon-- tal or the vertical reci rocating gear. Moreover, according to t e present invention,

trical control gear actuated by the reciprocating part and adapted when connected to a motor to reverse and control its rotation so that it reciprocates the tool; a second electrical control gear actuated by the reciprocating part and adapted when connected to a motor to impart to the latter, between the.

cutting strokes, alimited angular movement; and change-over switches adapted to connect the two motors respectively to the two control gears in alternative manner; substantially as described.

In testimon whereof I afiix my signature in presence 0 two witnesses.

ARTHUR PEMBERTON WOOD.

Witnesses:

R031. 0. Ronnn'rs, Josnrn E. Hms'r.

.tively to the said operating means; an elec- 

